For examples and explanations, see the Vancouver or Edmonton downloads.
Charlie did not make a big distinction between speed endurance and special endurance, calling both SE often. Speed would something like 6X60 with full recovery. SE would be 80+100+120, and special endurance for many people would be 200s or 300s with recovery of 15-30 minutes.
Also, everything over 80 meters or 8 seconds qualifies as sub-max.
Wasn’t Ben Johnson if you were referring to Special Endurance. Probably was Desai Williams who ran close to 31 seconds for a 300m rep. Ben was known for his acceleration and max velocity. His speed endurance was improving as he matured, but I wouldn’t say it was in the same ballpark as someone like Carl Lewis.
i think it was in the thread where we were trying to guess bj’s max squat. people were speculating itd be over 700, but cf said it was probably his great se that allowed him to do the 6x660 or whatever it was